Emma Thompson lost two dresses sizes in just six weeks after turning to Kate Middleton’s diet guru and trainer for advice.

And the Love Actually star is so pleased with the results she’s even written the foreword to dietician Louise Parker’s new healthy living book.

Emma, 57 dropped from a size 14 to a size 10 using Louise’s guidance and has written gushing praise for The Louise Parker Method: Lean For Life: The Cookbook.

Emma is looking fabulous these days (Image: AFP)

Kate is believed to be one of Louise's clients (Image: Getty)

“I love that her method is NOT a diet - and is genuinely sustainable - so I can have my glass of wine and manage to avoid spending the rest of the week eating cheesy Wotsits,” jokes Emma.

“She toughens me up without driving me round the bend with kale juice and the more depressing style of sprout. She just gets it. We all use her, because she’s discreet and funny and that’s really important.”

Emma's praise also appears on the book's cover.

According to Daily Mail , Louise's clients embark on a six-week intensive course that costs £4,500 and includes healthy eating solutions and 90-minute sessions of exercise six times a week.

Louise has 20 years experience in body sculpting, fitness and nutrition (Image: rodelrio)

In her own foreword to the book, Louise says her method is “a lifestyle, a habit, an attitude and not a diet."

She adds: It’s a real life solution to permanent weight loss and optimum health, while allowing all the pleasure of life – in moderation – to keep you sane and happy.”

Louise is believed to have worked with The Duchess of Cambridge among other high profile clients but prefers to stay discreet about their names.

Kate always looks healthy

According to The Telegraph , the in-demand dietician and trainer has a team of people working for her, but she will only personally take on three clients at a time so as to ensure they get her full attention.

“Everyone’s struggle is the same whether you’re on the cover of Tatler or not,” she explains.

Meanwhile, Emma – who appears in the upcoming Beauty and the Beast live action movie – has spoken in the past about the pressures facing young women in Hollywood when it comes to image.

She previously told The Telegrap h: “It seems young actresses are under pressure to look a particular way.

“They look the same, that’s the thing. And they’re all being photoshopped in adverts for all sorts of (products), so maybe that’s difficult as well — because you’ve got pictures of yourself looking perfect.

"They have to be this specific model size, and if they get on to the red carpet, they’re all having to walk like models and dress like models. I think the pressure is terrible.”